120results about How to "Processing window width" patented technology

The invention provides a method for synthesizing a homopolymer and a copolymer of long-carbon-chain semi-aromatic high-temperature-resistant polyamide and polymerization products obtained by the method. The method comprises the following steps of: (a) prepolymerizing terephthalic acid and 1,10-decanediamine in a molar ratio of 1:(1.00-1.02) and optional copolymerization components to obtain a prepolymer that the intrinsic viscosity is controlled to be between 0.4 and 1.1dl/g; and (b) performing solid-phase polymerization on the prepolymer in step (a) to obtain the long-carbon-chain semi-aromatic high-temperature-resistant polyamide PA10T or the copolymer thereof, wherein the intrinsic viscosity is controlled to be between 1.2 and 2.6dl/g.

The invention discloses a novel phthalonitrile resin and a preparation method thereof. Compared with a conventional phthalonitrile resin (only 4-nitro phthalonitrile as an end-capping reagent, the novel phthalonitrile resin is introduced with 3-nitro novel phthalonitrile resin to cooperate end capping, and thus the asymmetry of a resin structure is increased and the turbidity of a resin component is increased (see a formula 1). Compared with the conventional phthalonitrile resin, the novel phthalonitrile resin disclosed by the invention has the characteristics of low melting temperature, good solubility, wide processing window, low curing temperature and the like; a prepared resin molded part and a resin-based composite material are low in porosity, excellent heat-resistant quality, and high in mechanical property, and can be applied to the fields of aerospace, a space technology, machine manufacturing, and the like as a light-weight and high-temperature resistant part. The formula is described in the specification.

The invention provides a preparation method of a TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 15mm-90mm. The invention also provides a preparation method of the TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) rolling; (5) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 8mm-15mm. The preparation method is simple in process, strong in repeatability and suitable for large-scale industrial production; the TC4ELI titanium alloy bar prepared by adopting the preparation method is uniform and fine in structure, high in microscopic structure level and excellent in mechanical property.

The invention relates to a laser welding tractable polycarbonate composition and a preparation method thereof. The composition comprises the following components in parts by weight: 50-80 parts of polycarbonate (PC) resin, 15-40 parts of ABS resin, 5-10 parts of amelt reinforcing agent, 0.1-1 part of a near infrared laser absorbent, 0.1-1 part of an antioxidant and 0.1-1 part of a lubricant. The preparation method of the alloy comprises the following steps: (a) mixing the PC resin, the ABS resin, the melt reinforcing agent, the near infrared laser absorbent, the antioxidant and the lubricant in a mixing agitator; and (b) performing blending granulation on the mixture obtained in the step (a) by virtue of a twin-screw extruder to obtain a product. Compared with the prior art, the polycarbonate composition provided by the invention is higher in melt strength after the melt reinforcing agent is added, so that the surface of a product after welding has no bulges orbreakdowns, welding can be performed under a higher laser intensity, the obtained product is higher in welding strength at the same time, a processing window of a laser welding process of the polycarbonate composition is broadened, and the laser welding tractable polycarbonate composition is obtained.

Ultrahigh-strength Ti-Al-Zr-Mo-Cr-series beta titanium alloy and a thermal treatment process thereof. The thermal treatment includes steps of performing solution treatment to Ti-Al-Zr-Mo-Cr-series beta titanium alloy and then performing aging treatment. The Ti-Al-Zr-Mo-Cr-series beta titanium alloy includes, by weight, 4.5-5.5% of Al, 3.5-4.5% of Zr, 9.5-10.5% of Mo, and 2.5-3.5% of Cr, the balanced being Ti. The alloy, after smelting, forging and toughening thermal treatment, has ultrahigh strength and plasticity. The alloy includes aluminum and also a certain amount of a neutral element, zirconium, so that alpha-phase is further reinforced; by adding the molybdenum at high mass percentage, a beta-matrix is reinforced; in addition, due to the low diffusion rate of molybdenum, temperaturesensitivity of the alloy in a two-phase zone during forging is reduced, thus enlarging processing window of the alloy.

The invention discloses a biodegradable film based on irradiation modification and a preparing method thereof. The degradable film is composed of, by weight, 100 parts of biodegradable materials, 0-5 parts of compatilizer, 0.05-5 parts of irradiation sensitizing agents, 0.05-3 parts of antioxidants, 0.1-2 parts of light stabilizer, 0.1-3 parts of anti-ultraviolet agents and 0-2 parts of lubricating agents in a mixed mode. Compared with the prior art, the biodegradable film has the following advantages of having excellent mechanical strength, barrier performance, ageing resistance and the like, and being innovative, and application of the biodegradable film is expanded; the composite film keeps complete biodegradable performance, and has high application potentiality in medical science and environmental science, the composite film can replace petroleum-base general films to be used greatly, and environmental pressure is relieved. The preparing method is simple and easy to implement, the addition quantity of all the auxiliaries is small, cost is low, and the production process is controllable.

The invention relates to a bisphenol A bisphthalonitrile resin containing an arylethernitrile chain segment, a cured resin and a preparation method thereof, belonging to the field of high polymer materials. The preparation method comprises the following steps: performing nucleophilic substitution reaction on bisphenol A and 2,6-dichlorobenzonitrile used as raw materials in a strongly polar solvent/methylbenzene mixed solution in the presence of anhydrous potassium carbonate or anhydrous sodium carbonate used as a catalyst, thus forming a hydroxyl-terminated bisphenol A low polymer intermediate; then, substituting hydroxyl therein with 4-nitrophthalonitrile, thus obtaining the target resin; and adding curing crosslinking agent of which the mass is equivalent to 5% of that of the resin into the resin, precuring at 220-240 DEG C, and performing heat treatment at a temperature not lower than 375 DEG C to obtain the cured resin. The bisphthalonitrile resin provided by the invention has different chain lengths, contains an arylethernitrile chain segment, and has a low melting point and a wide curing processing temperature; the cured resin is in a network structure comprising phthalocyanine rings and triazine rings, and has excellent heat stability; and the provided preparation method of the resin and the cured resin is simple and controllable, and is suitable for industrial production.

The present invention discloses a copolymer composition containing an ethylene and vinyl alcohol structure unit, and a preparation method thereof. The composition comprises components A, B, C and D, wherein the component A is a copolymer containing an ethylene and vinyl alcohol structure unit, the component B is an acid, the component C is a phenol or amine organic compound, the component D is an alkali metal or an alkaline earth metal salt, and by adopting the mass of the component A as 100%, the mass contents of the components B and D are 0.1-4.0%, and the mass content of the component C is 0.01-1.8%. The preparation method specifically comprises: (1) preparation of the solution of a copolymer containing an ethylene and vinyl alcohol structure unit; (2) preparation of the solution of a copolymer composition containing an ethylene and vinyl alcohol structure unit; and (3) sold molding of the copolymer composition containing the ethylene and vinyl alcohol structure unit. According to the present invention, the composition has characteristics of uniform component dispersion, high thermal stability, and product quality improving.

The invention discloses polycarbonate alloy. The polycarbonate alloy is characterized by being prepared from, by weight, 70 parts of polycarbonate and 1-60 parts of ABS resin; a pH value of the polycarbonate alloy is 6.3-6.9 and regulated through liquid acid. By regulation of the pH value of the polycarbonate alloy, high hydrothermal stability, wide process window and the like of the polycarbonatealloy are guaranteed.

The invention relates to the technical field of functionalization and high performance of plastic pipes, in particular to a graphene modified oxygen-resistant polyethylene master batch and a preparation method and application thereof. The modified plastic master batch is composed of the following components: a polyethylene matrix, graphene, a second oxygen inhibitor, a coating agent, a surface treating agent, a dispersing agent and an antioxidant. According to the three-step production process, the mixing, dispersing and stripping effects of graphene in a polyethylene matrix are improved, thefilling proportion of graphene in the composite material is increased through organic combination of a new material, a new technology and a new method, and formation of a perfect network structure inthe composite material matrix is promoted. The oxygen barrier property of the composite material can be remarkably improved through good construction of a network, so that the application potential ofgraphene in the oxygen barrier pipe is brought into full play, and the pipe filled with the high-barrier graphene nanosheet layer structure is obtained.

The invention discloses polythioether ketone imide terpolymer and a preparation method thereof. The polythioether ketone imide terpolymer is characterized by being prepared by the following steps of: adding sulfur, disubstituted phthalimide, disubstituted ketone, a reducing agent and a reaction assistant into a reactor into which a solvent is filled; heating to react for a certain period of time;pouring reaction solution into a precipitator; and stirring, purifying and drying. Compared with the prior art, the invention has the advantages that: the disubstituted phthalimide and the disubstituted ketone are used as raw materials and the sulfur is used as a coupling agent for preparation; and an obtained product is hypocrystalline and has high dissolubility, mechanical performance and heat resistance, low melting viscosity, wider processing window and high processing performance.

The present invention relates to an environmental-protection bio-based semi-aromatic PA10T/11 copolymerization material and a preparation method thereof, wherein the environmental-protection bio-based semi-aromatic PA10T/11 copolymerization material is prepared from the following components by mole: 20 parts of terephthalic acid, 18.5-20 parts of diaminodecane, 1-4.5 parts of 11-aminoundecanoic acid, 0.05-0.1 part of a nucleating agent, 0.002-0.005 part of a catalyst, and 250-300 parts of a solvent. Compared to the material in the prior art, the material of the present invention has the following characteristics that the monomer 11-aminoundecanoic acid in the PA10T/11 provides the flexible chain segment to the main chain molecule, such that the flexibility of the main chain molecule is increased, the toughness is improved, the obtained product has the wide processing window, and the molding processing difficulty is lower than the molding processing difficulty of PA10T; and the synthesis material has characteristics of low water absorption and good material stability. According to the present invention, the PA10T/11 is prepared by using the one-step melt condensation polymerization method so as to continuously perform the whole polymerization process, wherein the one-step melt condensation polymerization method has advantages of less process step, short polymerization period, high production efficiency, low production cost and the like, and creates the conditions for the future continuous industrial production.

The invention discloses a high-fiber volume content polylactic acid (PLA) homopolymer composite material and a preparation method thereof. A reinforced phase is a PLA fiber of which the content of a dextrolactic acid structure unit (D-LA) is 0-10mol% and a matrix is PLA of which the content of the dextrolactic acid structure unit (D-LA) is 10-50mol%, or the reinforced phase is an isotactic composite polylactic acid (sc-PLA) fiber, wherein sc-PLA is a mixture of poly L-lactic acid (PLLA) and poly D-lactic acid (PDLA), the weight ratio of the PLLA to the PDLA is 1:1 and the matrix is PLA of which the D-LA content is 0-100mol%; and the volume content of the strengthened phase is 5-90mol%. The preparation method of the corresponding composite material comprises the steps of (1) processing the PLA fiber of a skin-core structure into fiber assemblies; (2) overlaying 1-1,000 layers of PLA fiber assemblies of the skin-core structure; and (3) forming a PLA homopolymer composite material through hot pressing of the PLA fiber assemblies of the skin-core structure on a hot press under the conditions that the pressure is 1-20MPa and the temperature is 100-210 DEG C. The obtained PLA homopolymer composite material can be applied to the fields of packaging, automobiles and the like.

The invention discloses a low-melting-pint aromatic-nitrile-group resin monomer and a preparation method thereof and an aromatic-nitrile-group polymer and a preparation method thereof. Under the condition of ensuring that thermal stability of resin is not affected greatly, the purposes of reducing a resin melting point, widening a resin processing window, lowering resin curing temperature and lowering the resin cost are achieved through changing the structure of the resin monomer. The aromatic-nitrile-group resin monomer is a bisphenol A type aromatic-nitrile-group resin monomer containing aromatic ether nitrile chain segments, has the advantages of a low melting point, a wide processing window, a low curing temperature and others, has better processing performance and keeps the good thermal stability, mechanical performance and flame resistance of aromatic-nitrile-group resin; meanwhile, side nitrile groups are introduced to increase the number of crosslinking points in the process of resin curing, finally, the effect of increasing crosslinking density is achieved, and the thermal stability of the resin is further improved.

The invention provides phenolphthalein type copolyimide. According to the phenolphthalein type copolyimide, a side-hanging phenolphthalein constructional unit and a side-hanging ether bond flexible unit are introduced into a rigid main chain of polyimide, and the phenolphthalein type copolyimide has the characteristics of good solubility, good processibility, good mechanical property, good heat resistance and the like, is suitable for injection molding, extrusion, mold pressing and solution spinning processing, and has a good application prospect in related fields of high-temperature-resistant engineering plastics, films, fibers, adhesives, coatings, advanced composite materials and the like. Besides, the phenolphthalein type copolyimide is prepared from raw materials including phenolphthalein monomer I, double-X-replaced polyimide monomer II and double-Y-replaced monomer III, and the phenolphthalein type copolyimide is prepared by virtue of an aromatic nucleophilic substitution reaction; the preparation method is low in cost, the polymer is excellent in performance and can be adjusted and controlled by virtue of a copolymerization unit, the defect that a dianhydride and diamine method adopted to prepare polyimide has a complex synthetic route is overcome, and the production cost of polyimide can be greatly reduced.

The invention provides polyamide-imide with an indan structure. The polyamide-imide has a structural formula as shown in the specification, and in the formula, n is from 1 to 8. The invention further discloses a material which is prepared after the polyamide-imide with the indan structure is cured at 220-380 DEG C, and a preparation method of the polyamide-imide with the indan structure. The invention studies the synthesis and the properties of polyamide-imide, thermal-curing polyamide-imide of different polymerization degrees is prepared from 5(6)-amino-1-(4-amino phenyl)-1,3,3-trimethyl indan as monomers, then the stacking density and the interaction of molecular chains can be reduced, the flexibility of the molecular chains can be improved, and finally polyamide-imide resin which is excellent in solubleness and excellent in thermal resistance can be synthesized.

The invention discloses a preparation method of polyphenylene sulfide resin for melt blowing. The preparation method is characterized by comprising the following steps: reacting p-dihalogenated benzene, an S<-2>-containing compound, an amide organic compound with alkali salt at a temperature 180-250 DEG C and a pressure of 0.1MPa-5.0MPa for 1-24 hours, so as to obtain a linear PPS prepolymer; andreacting the linear PPS prepolymer with dihalogenated hydrocarbon at a temperature of 230-280 DEG C and a reaction pressure of 0.1MPa-5.0MPa for 1-24 hours, so as to obtain PPS resin for melt blowing,wherein dihalogenated hydrocarbon is m-dihalogenated aromatic hydrocarbon or p-dihalogenated hydrocarbon. When being added, m-dihalogenated aromatic hydrocarbon is taken as a structural regulator, and the high-entanglement helical-structure or spring-structure PPS resin for melt blowing is obtained; and when being added, p-dihalogenated hydrocarbon is taken as a chain extender, and high-linearityand relatively-low-viscosity PPS resin for melt blowing is obtained. The preparation method is relatively low in processing temperature, so that the decomposition and carbonization of PPS can be inhibited, and the oxidation and crosslinking of PPS can be prevented.